Improvement in rotary blowers



diridr %iatz5 @anni @da Letters Patent No. 110,929, 4dated January 10, 1871. l

IMPROVEMENT IN RCTARY BLOWERS.

The Schedule referred to in these Letters Patent and making part of the sar-ne.

To all whom. may concern Beit known that we, HENRY C. M eILwAnr and l ALONZO BRUMFIEL, ot' Gonneisville, in the 'county of Fayette and Statev of Indiana, have invented certain new and useful Improvements "in Rotary Blowers; and we -do hereby declare thatthe following is a full, clear, and exact description thereof, reference beiug had to the accompanying drawing and to the letters of reference marked thereon which form a part of this specification.

Our present invention is intended as an improvement upon the rotary blower for which Letters YPatent were granted to us May 24, 1870; and

-It consists in placing rubs at intervals around the inside of the casing for a purpose that will be hereinafter fully set forth.

In order to enable others skilled in the art to which our invention appertaius to make and use the same, we'will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure 1 represents one of the fans finishing its discharge for one revolutionand the other fan ou point of commencing to discharge.

Figure 2 represents a half-way position of the fans.

A represents :the stationary shell or casing.

B B, fans which -are A geared together and run at equal velocity.

Ur G are openings at the bottom and eaehend of casing to receive air; and v 1I is the opening at the top ofthe case for discharge orilice, which may be of any suitable size or shape.

'F F are rubs, whichmay be adjustable and made of soft metal, rubber, wood, or other suitable material.

. They areplaced at intervals around the inside of the casing A, so that the 'long back or extremity of the fans will bridge from one.to the other'and not touch the casebetween the rubs butl all the time Abe in contact with onej-of them, and thus let no airV escape back to the receiving orilice an'd secure the same airtight effect as if thewhole of the cylindrical part of the case was bored outor made true and the fans fitting air-tight and rubbing all the way around.

The advantages gained will be cheapness and ease of construction and considerable reduction of friction; infact, to almost nothing.

' We are aware of the patent grautedhto P. H. 85 F. M. Roots, January 21',` 1868, the diiference between our` invention and theirs being that they employ strips of metal or wood across the minor surface of the shell, so as to obviate the necessity of finishing oif the whole inner surface, and also for the purpose of reducing the friction of the pistons iu their revolotions; whereas, we employ adjustable strips of rubber, so arranged ou the interior of the case that in the revolutions of the fans, no air can escape except through the orifice intended for this purpose.

What we claim, therefore, is- The adjustable rubber rubs, in combination with fans B B, relatively so .arranged that .the fans will Vbridge. from one rub to the other, at or near the point of deviation from the line of the arc in the and for the' purpose set forth.

In testimony that we claim the foregoing as our own we aixour signatures in `presence of two Witnesses. HENRY G. MGILWAIN. ALONZO BRUMFIEL.

shell, as

Witnesses:

SAMUEL GREEN, GEORGE MORRIS. l 

